Agh, currently stuck on part 14. "Test if the save is functional"Yeah, been a while since I followed tools, I don't know if there's anything newer/better.
That, or something like that, will let you backup and restore your EmuNAND at will, which is all that step in particular does.
I get a black screen on boot, so I did this troubleshooting thing and installed all the .cia's https://3ds.guide/troubleshooting#twl_broken
Still black screen, I just reinstalled the game, still black screen
Agh